Complete genome structure of the thermophilic cyanobacterium Thermosynechococcus elongatus BP-1 - PubMed (original) (raw)
. 2002 Aug 31;9(4):123-30.
doi: 10.1093/dnares/9.4.123.
Takakazu Kaneko, Shusei Sato, Masahiko Ikeuchi, Hiroshi Katoh, Shigemi Sasamoto, Akiko Watanabe, Mayumi Iriguchi, Kumiko Kawashima, Takaharu Kimura, Yoshie Kishida, Chiaki Kiyokawa, Mitsuyo Kohara, Midori Matsumoto, Ai Matsuno, Naomi Nakazaki, Sayaka Shimpo, Masako Sugimoto, Chie Takeuchi, Manabu Yamada, Satoshi Tabata
Affiliations
- PMID: 12240834
- DOI: 10.1093/dnares/9.4.123
Free article
Complete genome structure of the thermophilic cyanobacterium Thermosynechococcus elongatus BP-1
Yasukazu Nakamura et al. DNA Res. 2002.
Free article
Abstract
The entire genome of a thermophilic unicellular cyanobacterium, Thermosynechococcus elongatus BP-1, was sequenced. The genome consisted of a circular chromosome 2,593,857 bp long, and no plasmid was detected. A total of 2475 potential protein-encoding genes, one set of rRNA genes, 42 tRNA genes representing 42 tRNA species and 4 genes for small structural RNAs were assigned to the chromosome by similarity search and computer prediction. The translated products of 56% of the potential protein-encoding genes showed sequence similarity to experimentally identified and predicted proteins of known function, and the products of 34% of these genes showed sequence similarity to the translated products of hypothetical genes. The remaining 10% lacked significant similarity to genes for predicted proteins in the public DNA databases. Sixty-three percent of the T. elongatus genes showed significant sequence similarity to those of both Synechocystis sp. PCC 6803 and Anabaena sp. PCC 7120, while 22% of the genes were unique to this species, indicating a high degree of divergence of the gene information among cyanobacterial strains. The lack of genes for typical fatty acid desaturases and the presence of more genes for heat-shock proteins in comparison with other mesophilic cyanobacteria may be genomic features of thermophilic strains. A remarkable feature of the genome is the presence of 28 copies of group II introns, 8 of which contained a presumptive gene for maturase/reverse transcriptase. A trace of genome rearrangement mediated by the group II introns was also observed.
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